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24 February, 09:50

What is a star's main fuel during its lifetime? A. hydrogen B. carbon C. helium D. oxygen

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  1. 24 February, 10:03
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    The star's main fuel during its lifetime is hydrogen. It is said that a star is composed of 97% hydrogen and 3% helium. Once the hydrogen of a star is gone, the star becomes old because it burns hydrogen during its lifetime.
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